1 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
2 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=gnu++98 %s
3 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=gnu++11 %s
5 // C++-specific tests for integral constant expressions.
11 static const int value = static_cast<int>(4.0);
15 if (const int value = 17) {
21 const int t=t; // expected-note {{declared here}}
22 #if __cplusplus <= 199711L
23 // expected-note@-2 {{read of object outside its lifetime}}
26 switch(1) { // do not warn that 1 is not a case value;
27 // 't' might have been expected to evalaute to 1
28 case t:; // expected-note {{initializer of 't' is not a constant expression}}
29 #if __cplusplus <= 199711L
30 // expected-error@-2 {{not an integral constant expression}}
32 // expected-error@-4 {{case value is not a constant expression}}
37 // PR6206: out-of-line definitions are legit
41 static const int kBar;
44 const int Foo::kBar = 20;
53 // PR6373: default arguments don't count.
54 void pr6373(const unsigned x = 0) {
55 unsigned max = 80 / x;
60 namespace rdar9204520 {
63 static const int B = int(0.75 * 1000 * 1000);
64 #if __cplusplus <= 199711L
65 // expected-warning@-2 {{not a constant expression; folding it to a constant is a GNU extension}}
69 int foo() { return A::B; }
74 int* y = reinterpret_cast<const char&>(x); // expected-error {{cannot initialize}}
76 // This isn't an integral constant expression, but make sure it folds anyway.
77 struct PR8836 { char _; long long a; };
78 #if __cplusplus <= 199711L
79 // expected-warning@-2 {{'long long' is a C++11 extension}}
82 int PR8836test[(__typeof(sizeof(int)))&reinterpret_cast<const volatile char&>((((PR8836*)0)->a))];
83 // expected-warning@-1 {{folded to constant array as an extension}}
84 // expected-note@-2 {{cast that performs the conversions of a reinterpret_cast is not allowed in a constant expression}}
86 const int nonconst = 1.0;
87 #if __cplusplus <= 199711L
88 // expected-note@-2 {{declared here}}
91 #if __cplusplus <= 199711L
92 // expected-warning@-2 {{folded to constant array as an extension}}
93 // expected-note@-3 {{initializer of 'nonconst' is not a constant expression}}
96 const int castfloat = static_cast<int>(1.0);
97 int arr2[castfloat]; // ok